from flask import Flask from flask_sqlalchemy import SQLAlchemy app = Flask(__name__) # app.config[‘SQLALCHEMY_COMMIT_ON_TEARDOWN‘] = False # app.config[‘SQLALCHEMY_TRACK_MODIFICATIONS‘] = True # app.config[‘SQLALCHEMY_ECHO‘] = True # pip install mysql-connecto class Config(object): ‘‘‘配置参数‘‘‘ SQLALCHEMY_DATABASE_URI = ‘mysql+mysqlconnector://root:[email protected]:3306/flask_db?charset=utf8‘ #自动跟踪数据库 SQLALCHEMY_TRACK_MODIFICATIONS = True app.config.from_object(Config) db = SQLAlchemy(app) class User(db.Model): __tablename__ = ‘bd_user‘ uid = db.Column(db.Integer,primary_key=True) name = db.Column(db.String(64),unique=True) email = db.Column(db.String(64),unique=True) password = db.Column(db.String(255)) image = db.Column(db.String(255)) role_id = db.Column(db.Integer,db.ForeignKey(‘db_roles.rid‘)) class Role(db.Model): __tablename__ = ‘db_roles‘ rid = db.Column(db.Integer,primary_key=True) name = db.Column(db.String(64),unique=True) users = db.relationship("User",backref="role") if __name__ == ‘__main__‘: db.drop_all() db.create_all() role1 = Role(name="admin") # session记录对象任务 db.session.add(role1) # 提交任务到数据库中 db.session.commit() role2 = Role(name=‘stuff‘) db.session.add(role2) db.session.commit() user1 = User(name=‘Tom‘,email=‘[email protected]‘,password=‘123456‘,image=‘/upload/img-0000.jpg‘,role_id=role1.rid) user2 = User(name=‘Jack‘,email=‘[email protected]‘,password=‘654321‘,image=‘/upload/img-0000.jpg‘,role_id=role2.rid) user3 = User(name=‘lili‘,email=‘[email protected]‘,password=‘345678‘,image=‘/upload/img-0000.jpg‘,role_id=role1.rid) user4 = User(name=‘Pack‘,email=‘[email protected]‘,password=‘964152‘,image=‘/upload/img-0000.jpg‘,role_id=role2.rid) db.session.add_all([user1,user2,user3,user4]) db.session.commit() ‘‘‘ Role.query.all() 查询所有 r2 = Role.query.first() r3 = Role.query.get(2) r3.name db.session.query(Role).all() db.session.query(Role).get(2) db.session.query(Role).first() User.query.filter_by() user = User.query.filter_by(name="Tom",role_id=1).first() user = User.query.filter(User.name=="Tom",User.role_id==1).first() 条件查询 from sqlalchemy import or_ User.query.filter(or_(User.name=="admin",User.email.endswith("163.com"))).all() User.query.filter().offset().limit().order_by().all() # offset跳过两条 limit取两条 User.query.offset(1).all() User.query.offset(1).limit(2).all() #不推荐 User.query.order_by("-uid").all() #推荐 降序 User.query.order_by(User.uid.desc()).all() #升序 User.query.order_by(User.uid).all() User.query.order_by(User.uid.asc()).all() # 分组 from sqlalchemy import func db.session.query(User.role_id,func.count(User.role_id)).group_by(User.role_id).all() ‘‘‘
原文地址:https://www.cnblogs.com/snow-wolf-1/p/11594814.html
时间: 2024-10-31 03:47:33